President Obama called on Russian president Vladimir Putin and the Russian government to work with the international community in investigating the downed Malaysian Airlines flight 17. The president also revealed that at least one American citizen died in the disaster, and called all deaths “an outrage of unspeakable proportions.”

“This should snap everybody’s heads to attention,” he said from the White House briefing room on Friday. “We don’t have time for propaganda, we don’t have time for games, we need to know exactly what happened.”

The president called for an “immediate cease-fire” by Russian, Ukrainian, and separatist forces in the region to allow the investigation to take place.

The president briefly touched on the disaster at the beginning of an infrastructure-spending speech in Delaware on Thursday.